高分求C# 的LCR校验码计算函数

Question

如题～分不够再给。有能力的情况下给分给到满意为止～

Answer 1

用一个Timer可以了，根据当前播放的时间读取歌词文件中的每行开头的时间，时间比对一致的话就显示该行歌词就行了。 
当然Timer的Interval要设置的间隔小一点喽

Answer 2

4楼的兄弟～我说的LCR并不是歌词～而是modbus协议中使用的校验码算法。

Answer 3

     public string LRC(string str) 
        {            
            int d_lrc = 0; 
            string h_lrc = ""; 
            int l = str.Length; 
            for (int c = 0; c < l; c = c + 2) 
            { 
                string c_data = str.Substring(c, 2); 
                d_lrc = d_lrc +Convert.ToInt32(c_data); 
            } 
            if (d_lrc >= 16) 
                d_lrc = d_lrc%16; 
            h_lrc = Convert.ToInt32(~d_lrc + 1).ToString("X"); 
            if (h_lrc.Length > 2) 
                h_lrc = h_lrc.Substring (h_lrc .Length -2,2); 
            return h_lrc; 
        }读书的时候记得，现在都忘了，这是网上找的，你看看对不

Answer 4

  static byte LRC(byte[] data)
  {
    byte lrc = 0;
    foreach (byte c in data)
    {
      lrc += c;
    }
    return (byte)-lrc;  
  }

Answer 5

        public static string checkSum(string writeUncheck)
        {
            char[] hexArray = new char[writeUncheck.Length];
            hexArray = writeUncheck.ToCharArray();
            int decNum = 0, decNumMSB= 0, decNumLSB = 0;
            int decByte, decByteTotal = 0;            bool msb = true;
            
            for( int t = 0; t <= hexArray.GetUpperBound(0); t++)
            {
                if((hexArray[t]>= 48) && (hexArray[t] <= 57))
                
                    decNum = (hexArray[t] - 48);
                
                else if ( (hexArray[t] >= 65) & (hexArray[t] <= 70))
                    decNum = 10 + (hexArray[t] - 65);                if (msb)
                {
                    decNumMSB = decNum * 16;
                    msb = false;
                }
                else 
                {
                    decNumLSB = decNum;
                    msb = true;
                }
                if (msb)
                {
                    decByte = decNumMSB + decNumLSB;
                    decByteTotal += decByte;
                }
            }            decByteTotal = (255 - decByteTotal) + 1;
            decByteTotal = decByteTotal & 255;            int a, b = 0;
            
            string hexByte = "", hexTotal = "";
            double i;            for (i = 0; decByteTotal > 0; i++)
            {
                b = Convert.ToInt32(System.Math.Pow(16.0, i));
                a = decByteTotal % 16;
                decByteTotal /= 16;
                if (a <= 9)
                    hexByte = a.ToString();
                else
                {
                    switch (a)
                    {
                        case 10:
                            hexByte = "A";
                            break;
                        case 11:
                            hexByte = "B";
                            break;
                        case 12:
                            hexByte = "C";
                            break;
                        case 13:
                            hexByte = "D";
                            break;
                        case 14:
                            hexByte = "E";
                            break;
                        case 15:
                            hexByte = "F";
                            break;
                    }
                }
                hexTotal = String.Concat(hexByte, hexTotal);
            }
            return hexTotal;
       }问题基本上解决，但还是有点问题，这算法是在codeproject找的。还是有时会计算错，不过比我之前的少。不知道什么回来。